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ICD-10 Guide
ICD-10 CodesO23.02

O23.02

Billable

Infections of kidney in pregnancy, second trimester

BILLABLE STATUSYes
IMPLEMENTATION DATEOctober 1, 2015
LAST UPDATED09/08/2025

Code Description

ICD-10 O23.02 is a billable code used to indicate a diagnosis of infections of kidney in pregnancy, second trimester.

Key Diagnostic Point:

Infections of the kidney during pregnancy, particularly in the second trimester, can pose significant risks to both the mother and the developing fetus. These infections, often categorized as pyelonephritis, can arise from ascending urinary tract infections (UTIs) that are common in pregnant women due to anatomical and physiological changes. The growing uterus can compress the ureters, leading to urinary stasis and increased susceptibility to infections. Symptoms may include fever, flank pain, dysuria, and increased urinary frequency. Prompt diagnosis and treatment are crucial to prevent complications such as preterm labor, low birth weight, and maternal sepsis. Antibiotic therapy is typically initiated based on culture results, with a focus on agents that are safe for use during pregnancy, such as penicillins and cephalosporins. Regular monitoring and follow-up are essential to ensure resolution of the infection and to mitigate risks to maternal and fetal health.

Code Complexity Analysis

Complexity Rating: Medium

Medium Complexity

Complexity Factors

  • Differentiating between types of urinary tract infections (UTIs) and pyelonephritis.
  • Understanding the impact of pregnancy on renal function and infection presentation.
  • Navigating antibiotic safety categories and their implications for treatment.
  • Documenting the severity and complications associated with kidney infections in pregnancy.

Audit Risk Factors

  • Inadequate documentation of the infection's severity and treatment plan.
  • Failure to specify the trimester of pregnancy.
  • Incorrect coding of associated conditions or complications.
  • Lack of follow-up documentation to confirm resolution of the infection.

Specialty Focus

Medical Specialties

Obstetrics and Gynecology

Documentation Requirements

Detailed clinical notes including symptoms, diagnostic tests, treatment plans, and follow-up care.

Common Clinical Scenarios

A pregnant patient presenting with flank pain and fever, diagnosed with pyelonephritis.

Billing Considerations

Consideration of the trimester and potential fetal implications when coding.

Maternal-Fetal Medicine

Documentation Requirements

Comprehensive documentation of maternal and fetal health status, including any high-risk factors.

Common Clinical Scenarios

Management of a high-risk pregnancy complicated by severe kidney infection.

Billing Considerations

Focus on the impact of maternal infections on fetal development and the need for multidisciplinary care.

Coding Guidelines

Inclusion Criteria

Use O23.02 When
  • According to ICD
  • CM guidelines, O23
  • 02 should be used when a kidney infection is diagnosed during the second trimester of pregnancy
  • Coders must ensure that the diagnosis is clearly documented and that any associated conditions are also coded appropriately

Exclusion Criteria

Do NOT use O23.02 When
No specific exclusions found.

Related ICD-10 Codes

Related CPT Codes

99223CPT Code

Initial hospital care, typically for a patient with a kidney infection.

Clinical Scenario

Used when a pregnant patient is admitted for severe pyelonephritis.

Documentation Requirements

Comprehensive documentation of the patient's condition, treatment plan, and response to therapy.

Specialty Considerations

Obstetricians should ensure that the documentation reflects the complexity of care provided.

ICD-10 Impact

Diagnostic & Documentation Impact

Enhanced Specificity

ICD-10 Improvements

The transition to ICD-10 has allowed for more specific coding of obstetric conditions, including infections during pregnancy. This specificity aids in better tracking of maternal health outcomes and resource allocation.

ICD-9 vs ICD-10

The transition to ICD-10 has allowed for more specific coding of obstetric conditions, including infections during pregnancy. This specificity aids in better tracking of maternal health outcomes and resource allocation.

Reimbursement & Billing Impact

The transition to ICD-10 has allowed for more specific coding of obstetric conditions, including infections during pregnancy. This specificity aids in better tracking of maternal health outcomes and resource allocation.

Resources

Clinical References

  • •
    CDC Guidelines for Antibiotic Use in Pregnancy

Coding & Billing References

  • •
    CDC Guidelines for Antibiotic Use in Pregnancy

Frequently Asked Questions

What are the common symptoms of kidney infections in pregnant women?

Common symptoms include fever, chills, flank pain, nausea, vomiting, and dysuria. Pregnant women may also experience increased urinary frequency and urgency.